Thanks for reporting this bug. When you say "reboot the machine and it comes alive again", do you mean that a soft reboot from inside the vm guest (i.e. not restarting qemu at all) brings the guest's network back up?
status: incomplete importance high ** Changed in: qemu-kvm (Ubuntu) Importance: Undecided => High ** Changed in: qemu-kvm (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu-kvm in Ubuntu. https://bugs.launchpad.net/bugs/1325560 Title: kvm vm loses network connectivity under "enough" load To manage notifications about this bug go to: https://bugs.launchpad.net/libvirt/+bug/1325560/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs